Can you jack up a cottage and build a slab on grade underneath it?
I have a cottage in Quebec which used to be resting on the ground. In the 1950s they dug under neath and poured concrete and used cement blocks to make a three quarter basement. It is wet in the spring and damp throughout the summer making the bungalow humid in all seasons. THis mostly due to the house being directly next to a hill.
I've looked at your radiant air heating solution and was wondering if it would be possible to raise the house 2-3 feet and put it on gravel and an insulated slab while turning the basement into a thermal battery by filling it with sand and running piples through it. If so, can you recommend any companies who would be up to the task?